#include <FastLED.h>

#define LED_PIN     6
#define NUM_LEDS    64
#define BRIGHTNESS  40
#define LED_TYPE    WS2811
#define COLOR_ORDER GRB

CRGB leds[NUM_LEDS];
uint8_t colorIndex = 0; 

// ১. নতুন পদ্ধতিতে প্যালেট তৈরি (এটি এরর মুক্ত)
DEFINE_GRADIENT_PALETTE( rainbow_gp ) {
  0,   255,  0,  0,   
    32,  255, 255,  0,  
      64,   0,  255,  0,  
        128,  0,   0,  255, 
          192, 255,  0,  255, 
            255, 255,  0,  0    
            };
            CRGBPalette16 myRainbow = rainbow_gp;

            // ২. ফন্ট ডাটা (A-Z)
            const uint8_t PROGMEM font[28][8] = {
              {0x18,0x3C,0x66,0x66,0x7E,0x66,0x66,0x66}, {0x7C,0x66,0x66,0x7C,0x66,0x66,0x7C,0x00},
                {0x3C,0x66,0x60,0x60,0x60,0x66,0x3C,0x00}, {0x78,0x6C,0x66,0x66,0x66,0x6C,0x78,0x00},
                  {0x7E,0x60,0x60,0x7C,0x60,0x60,0x7E,0x00}, {0x7E,0x60,0x60,0x7C,0x60,0x60,0x60,0x00},
                    {0x3C,0x66,0x60,0x6E,0x66,0x66,0x3C,0x00}, {0x66,0x66,0x66,0x7E,0x66,0x66,0x66,0x00},
                      {0x3C,0x18,0x18,0x18,0x18,0x18,0x3C,0x00}, {0x1E,0x0C,0x0C,0x0C,0x0C,0xCC,0x78,0x00},
                        {0x66,0x6C,0x78,0x70,0x78,0x6C,0x66,0x00}, {0x60,0x60,0x60,0x60,0x60,0x60,0x7E,0x00},
                          {0x63,0x77,0x7F,0x6B,0x63,0x63,0x63,0x00}, {0x66,0x6E,0x7E,0x76,0x66,0x66,0x66,0x00},
                            {0x3C,0x66,0x66,0x66,0x66,0x66,0x3C,0x00}, {0x7C,0x66,0x66,0x7C,0x60,0x60,0x60,0x00},
                              {0x3C,0x66,0x66,0x66,0x6E,0x3C,0x0E,0x00}, {0x7C,0x66,0x66,0x7C,0x78,0x6C,0x66,0x00},
                                {0x3C,0x66,0x60,0x3C,0x06,0x66,0x3C,0x00}, {0x7E,0x18,0x18,0x18,0x18,0x18,0x18,0x00},
                                  {0x66,0x66,0x66,0x66,0x66,0x66,0x3C,0x00}, {0x66,0x66,0x66,0x66,0x66,0x3C,0x18,0x00},
                                    {0x63,0x63,0x63,0x6B,0x7F,0x77,0x63,0x00}, {0x66,0x66,0x3C,0x18,0x3C,0x66,0x66,0x00},
                                      {0x66,0x66,0x66,0x3C,0x18,0x18,0x18,0x00}, {0x7E,0x06,0x0C,0x18,0x30,0x60,0x7E,0x00},
                                        {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}, {0x00,0x00,0x00,0x00,0x00,0x60,0x60,0x00}
                                        };

                                        void drawPixel(int x, int y, CRGB color) {
                                          if (x >= 0 && x < 8 && y >= 0 && y < 8) {
                                              int index;
                                                  if (x % 2 == 0) index = (x * 8) + y; 
                                                      else index = (x * 8) + (7 - y);
                                                          leds[index] = color;
                                                            }
                                                            }

                                                            int getFontIndex(char c) {
                                                              if (c >= 'a' && c <= 'z') c -= 32;
                                                                if (c >= 'A' && c <= 'Z') return c - 'A';
                                                                  if (c == ' ') return 26;
                                                                    if (c == '.') return 27;
                                                                      return 26;
                                                                      }

                                                                      void scrollTextWithPalette(String text, CRGBPalette16 palette, int speed) {
                                                                        int textLen = text.length();
                                                                          for (int scrollPos = 0; scrollPos < (textLen * 8) + 8; scrollPos++) {
                                                                              FastLED.clear();
                                                                                  colorIndex += 4; 
                                                                                      for (int charIdx = 0; charIdx < textLen; charIdx++) {
                                                                                            int charXPos = (charIdx * 8) - scrollPos + 8;
                                                                                                  if (charXPos > -8 && charXPos < 8) {
                                                                                                          int fontIdx = getFontIndex(text[charIdx]);
                                                                                                                  for (int row = 0; row < 8; row++) {
                                                                                                                            uint8_t rowData = pgm_read_byte(&(font[fontIdx][row]));
                                                                                                                                      for (int col = 0; col < 8; col++) {
                                                                                                                                                  if (rowData & (1 << (7 - col))) {
                                                                                                                                                                CRGB pixelColor = ColorFromPalette(palette, colorIndex + (charXPos * 5));
                                                                                                                                                                              drawPixel(charXPos + col, row, pixelColor);
                                                                                                                                                                                          }
                                                                                                                                                                                                    }
                                                                                                                                                                                                            }
                                                                                                                                                                                                                  }
                                                                                                                                                                                                                      }
                                                                                                                                                                                                                          FastLED.show();
                                                                                                                                                                                                                              delay(speed);
                                                                                                                                                                                                                                }
                                                                                                                                                                                                                                }

                                                                                                                                                                                                                                void setup() {
                                                                                                                                                                                                                                  FastLED.addLeds<LED_TYPE, LED_PIN, COLOR_ORDER>(leds, NUM_LEDS);
                                                                                                                                                                                                                                    FastLED.setBrightness(BRIGHTNESS);
                                                                                                                                                                                                                                    }

                                                                                                                                                                                                                                    void loop() {
                                                                                                                                                                                                                                      scrollTextWithPalette("KALINGA CORPORATION", myRainbow, 80);
                                                                                                                                                                                                                                      scrollTextWithPalette("KALINGA CORPORATION", myRainbow[2], 80);
                                                                                                                                                                                                                                      }